Advice needed ... Tamoxifen or AI?

[Lucy]

I gained 30 pounds during chemotherapy. When I went off, I worked diligently to lose the weight and was 15 pounds down before I started anastrazole (aka arimidex). Since starting the anastrazole (I was reluctant to take it so waited roughly 3 months after chemo to start) I can't lose weight to save my life, no matter how I eat. I told my oncologist that it doesn't matter if I have a diet of chocolate and cookies or a healthy vegan diet, the number on the scale doesn't fluctuate. It's very frustrating. The point here is I don't know if your weight would go up on anastrazole but losing weight isn't something I'm able to do on anastrazole.